The science teacher believed very strongly in practical work as a means of teaching science effectively, and she wanted her pupils’ parents to see how ___1___ their children were learning by her methods. She ___2___arranged for all the parents to comeand see the ___3___ of one of the children’s experiments on a Saturday evening,___4___ all of them were free. The children had been studying the growth of plants, and they had planted four pots of beans a few weeks ___5___. They had put poor soil in one pot, to see___6___ effect this would have___7___ the growth of the beans in___8___, and good soil in___9___ three pots. Then they had put one of the pots in the ___10___ for several days, and had given a third pot no ___11___ for the same length of time.

At the end of the lesson on Friday afternoon, the teacher put little notices on the four ___12___: “The beans in this pot were planted in poor soil.” “This pot has been kept in the dark for four ___13___.” “These beans have had no water for four days.” “These beans have had good soil, ___14___ light and regular water.” Then the teacher went home.(www.yygrammar.com)

When she arrived on ___15___ evening, half an hour before the ___16___ were due to come, she found this note beside the pots: “We read your ___17___ to the school servant and thought we would help him, so we watered all the plants, changed the earth in the one with___18___ soil, and left the light on ___19___ the one that had been left in the dark for four days. We hope that the plants will now grow___20___.”(www.nmet168.com )